Fluid-flow measuring or regulating device.



l W. KIESBR. y FLUID PLOW MEASURING 0R REGULATING DEVICE. APPLICATIONFILED SEPT. 8, 1910.

l1,025,809.v Patented May '2,' 1912.

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VALTER KIESER, OF BERLIN, GERMANY, ASSIGNOR T0 GENERAL ELECTRIC COM-PANY, A CORPORATION 0F NEW YORK.

FLID-FLOWiMEASURING OR REGULATING DEVICE.

Specification of Letters Patent.

Patented May 7S it@ Application filed September 8, 1910. Serial No.580,964.

Germany7 have invented certain new and useful improvements in FluidsFlowMeasur ing or Regulating Devices, of which the following is aspecification.

rlhis invention relatesl to apparat-us for measuring the iiow of a duidthrough a conduit or regulating the supply of fluid to a conduit, andits object is to utilize for this purpose the difference in thepressures existing in the conduit. and in a constricted portion thereof.In the well known Venturi tube the pressure inthe `throat is less thanthatl inthe conduit on the supply side of said throat. I introduce intothe conduita tubular or like member adapted to form a' constricteddischarge nozzle at that point, the smaller end of said nozzle beingturned toward the flowing Huid. Opposite and adjacent to said smallerend I locate a movable element. formingin eifect an admission nozzle andbiased away from said discharge nozzle by a spring or its equivalent.``The Flow of the fluid through this compound nozzle produces a partialvacuum in the space or gap between the movable admission and fixed`discharge portions of said nozzle, and since the former portion isexposcal on its other side to the full conduit pressure, the unbalancedexcess of conduit pressure tends to move the movable portion toward thefixed portion against the tension ot the spring. ly suitably adjustingthe spring, the amount ot morementof the movable element becomes ameasure of the pressure diti'erence. and hence a measure ot the volumeot' liuid liowing through the nozzle, in accordance with the well-knownrule with reference to Vent/uri tubes. ln order to indicate the travelot the moving element, it is mounted. for example. on a shat'tiextending through the wall ot the conduit and carryingl lever-armwhich can be connected to suitable indicating or registering mecha--nism, or to means for regulating the supply ot the tiuid to the conduit.

ln the accompanying drawing,-l`igure l a longitudinal section of aconduit equipped with one embodiment. of my tlow meter; F ig. 2 is across section of the same on the line Q--2, Fig. l; and Figsp?, and etare sectional views simiiar to Fig. 1, showing mod ications ot thedevice.

l the In the conduit 4l introduced the discharge nozzle which in Fig. 1appears as a. tubular bushing. 2 for the conduit having a centralpassage 3 tlaringfrom a narrow4 ,cnt-rance to a widedelivery end. Ashort `distance in front,l` of the narrow entrance is located a flexiblediaphragm or partition i `secured firmly at its peripheryto the contionin pressure and a corresponding increase in velocity ot the fluidtlowingthere;

through. Between thc diaphragm and the front face ot the dischargenozzle is a gap G. Bearing against the diaphragm on both sides of themouth-piece are the arms of a forked lever 7 which is secured to a shaft8 passing transversely lthrough a small pocket l at one side of theconduit. Secured to the shaft outside of said pocket is a lever-arm 9which is .connected by a rod l() with any desired indicating orregistering or regulating apparatus (not shown). The admission nozzle isbiased away from the discharge nozzle by some suitable yielding device.such as a spring ll, attached at one end to a suitable support and atthe other to a screw-threaded rod 12 which passes through an eye in thelever-arm 9 and is provided with a thumb nut 't3 for the purpose ofadjusting the tension oi" said spring.

ln Fig. 3 the constricted opening through discharge nozzle is annular.being toi-ined by a conical body l-t 'centrally supported in theconduit` by wings 15. vThe base of the cone faces the iowing duid andadjacent to said base is a hemispherical conduit and carrying a largetunnel 2O which receives practically all the fluid flowing in saidconduit. The disk is held yieldingly in a central position a littledistance away from the bushing 2, by means of springs 2l extendingradially from the funnel to the walls of the conduit. The arms of the'forked lever 22 are slotted to engage with pins 23 on the sides of saidfunnel.

lThe'operation is as follows: Upon that side of the movable admissionnozzle, which is turned toward'the flowing fluid, there is exerted apressure which varies withA that of the fluid. In the gap between themovable element and t-he front face of the stationary discharge nozzlethere exists, on the I other hand, a much lower pressure, being the sameas that in the narrow constrictegl entrance of thedischarge nozzle,apressure which may be reduced, by suitably forming the nozzle, to thecritical pressure, that is, the pressure having such-a relation to thepressure in the co-nduit as to give the maximum flow through the nozzle.The moving element or admission nozzle will, therefore, have a tendencyto approach the face of the dischargenozzle, 'said tendency varying withthe amountof fluid flowing through the nozzle and being opposed by thetension ofthe spring. In consequence of this, the rod is actuated inaccordance with t-he amount of the fluid flowing through the device. Theconstruction shown in Fig, 4 permits the utilization of theentire'pressure prevailing in the gap, v,without hindrance of any sortto the passage of the fluid through the admission nozzle.

In accordance with the provisions of the patent statutes, I, havedescribed the principle of operation of my invention, together with theapparatus which Inow consider to represent the best embodiment thereof;but I desire to have'v it understood that 'the apparatus shown is onlyillustrative, and that the invention can be carried out by other means.

What -I claim as new and desire to secure by Letters Patent of theUnited States,

ed to one of the nozzles for measuring the drop between the 1n the gap.

2. The combination with a conduit,

conduit pressure and that relatively movable admission and dischargenozzles therein affording a constricted opening therethrough, meansmounting the nozzlesin the conduit so that there is a gap between themthat is in communication with the opening, and means for utilizing therelative, movements of said nozzles due to variations in pressure in theconduit and in said const-ricted opening.

3. The combination with a conduit, of a xed discharge nozzlel thereinaording a constricted opening, a movable admission nozzle in front ofthe discharge nozzle, there being a gap between the nozzles that is incommunication with the opening, means biasing said nozzles apart, andmeans. for transmitting the movements of said admission nozzle due tothe variations betweenthe conduit pressure and that in said gap, saidpressures acting on opposite sides of the nozzle.

4. The combination with a conduit, of a fixed discharge nozzle thereinaffording a constricted opening, a movable admission nozzle in front ofsaid discharge nozzle, there being a gap between the adjacent faces ofthe nozzles that is in communication with the opening, a lever connectedwith said admission nozzle, a transverse shaft on which said lever ismounted, a lever-arm on said shaft outside the conduit, and a spring'acting upon said lever-arm.

5. The combination with a conduit: through which fiuidfiows, of a memberarranged in the conduit to form an orifice or nozzle through which,fluid fiows from one section of the conduit to another, the inlet areaof said orifice or nozzle being smaller than the erossssection of theconduit and the nozzle acting to cause a drop in pressure in WALTERKIESER. Witnesses ERICH UBERLE, GUsTAv HULBnoCH.

